/* --- CSS 变量与全局设置 --- */
:root {
	--bg-dark: #0d1117;
	--bg-card: #161b22;
	--border-color: #30363d;
	--text-primary: #c9d1d9;
	--text-secondary: #8b949e;
	--accent-color: #58a6ff;
	--accent-hover: #79c0ff;
	--font-heading: "Poppins", sans-serif;
	--font-body: "Lato", sans-serif;
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	font-family: var(--font-body);
	background-color: var(--bg-dark);
	color: var(--text-primary);
	line-height: 1.6;
}

.container {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 20px;
}

/* --- 头部英雄区域 --- */
.hero {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	height: 100vh;
	text-align: center;
	background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
	position: relative;
}

.hero-content {
	animation: fadeIn 1.5s ease-in-out;
}

.logo {
	font-family: var(--font-heading);
	font-size: clamp(3rem, 15vw, 7rem); /* 响应式字体 */
	font-weight: 700;
	color: transparent;
	background: linear-gradient(45deg, #ffffff, #a7c5eb);
	-webkit-background-clip: text;
	background-clip: text;
	margin-bottom: 0.5rem;
}

.tagline {
	font-size: clamp(1.1rem, 4vw, 1.5rem);
	color: var(--text-secondary);
	font-weight: 400;
	letter-spacing: 1px;
}

.scroll-down-arrow {
	position: absolute;
	bottom: 30px;
	left: 50%;
	transform: translateX(-50%);
	width: 24px;
	height: 40px;
	border: 2px solid var(--text-secondary);
	border-radius: 20px;
	animation: bounce 2s infinite;
}
.scroll-down-arrow::before {
	content: "";
	position: absolute;
	top: 8px;
	left: 50%;
	width: 6px;
	height: 6px;
	background-color: var(--text-secondary);
	border-radius: 50%;
	transform: translateX(-50%);
	animation: scroll-dot 2s infinite;
}

/* --- 门户入口区域 --- */
.portal-section {
	padding: 100px 0;
	background-color: var(--bg-dark);
}

.portal-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
	gap: 30px;
}

.portal-card {
	background-color: var(--bg-card);
	border: 1px solid var(--border-color);
	border-radius: 12px;
	padding: 35px 30px;
	text-align: center;
	transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.portal-card:hover {
	transform: translateY(-10px);
	box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
	border-color: var(--accent-color);
}

.card-icon {
	font-size: 2.5rem;
	margin-bottom: 15px;
}

.portal-card h2 {
	font-family: var(--font-heading);
	font-size: 1.5rem;
	margin-bottom: 10px;
	color: var(--text-primary);
}

.portal-card p {
	font-size: 0.95rem;
	color: var(--text-secondary);
	margin-bottom: 25px;
	min-height: 50px;
}

.card-button {
	display: inline-block;
	background-color: transparent;
	color: var(--accent-color);
	border: 1px solid var(--accent-color);
	padding: 10px 25px;
	border-radius: 50px;
	text-decoration: none;
	font-weight: 700;
	cursor: pointer;
	transition: background-color 0.3s ease, color 0.3s ease;
	font-family: var(--font-body);
	font-size: 1rem;
}

.card-button:hover {
	background-color: var(--accent-color);
	color: var(--bg-dark);
}

/* --- 关于我们 & 页脚 --- */
.about-section {
	padding: 80px 0;
	background-color: var(--bg-card);
	text-align: center;
}

.about-section h2 {
	font-family: var(--font-heading);
	font-size: 2.5rem;
	margin-bottom: 20px;
}

.about-section p {
	max-width: 700px;
	margin: 0 auto;
	color: var(--text-secondary);
}

.site-footer {
	background-color: var(--bg-dark);
	padding: 40px 0;
	text-align: center;
	color: var(--text-secondary);
	border-top: 1px solid var(--border-color);
}

.social-links {
	margin-top: 15px;
}

.social-links a {
	color: var(--text-secondary);
	text-decoration: none;
	margin: 0 15px;
	font-size: 1rem;
	transition: color 0.3s ease;
}

.social-links a:hover {
	color: var(--accent-hover);
}

/* --- 模态框样式 --- */
.modal {
	display: none;
	position: fixed;
	z-index: 1000;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(0, 0, 0, 0.8);
	animation: fadeIn 0.3s ease-in-out;
}

.modal-content {
	position: relative;
	background-color: var(--bg-dark);
	margin: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	overflow: auto;
}

.close {
	position: absolute;
	top: 20px;
	right: 30px;
	color: var(--text-secondary);
	font-size: 35px;
	font-weight: bold;
	cursor: pointer;
	z-index: 1001;
	transition: color 0.3s ease;
}

.close:hover {
	color: var(--accent-hover);
}

.coming-soon-container {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	text-align: center;
	padding: 40px 20px;
	background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
}

.coming-soon-container h1 {
	font-family: var(--font-heading);
	font-size: clamp(2.5rem, 10vw, 4.5rem);
	color: var(--text-primary);
	margin-bottom: 1rem;
}

.coming-soon-container p {
	font-size: 1.1rem;
	color: var(--text-secondary);
	max-width: 500px;
	margin-bottom: 2.5rem;
	line-height: 1.6;
}

.subscribe-form {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 15px;
	width: 100%;
	max-width: 500px;
	margin-bottom: 2.5rem;
}

.subscribe-form input[type="email"] {
	flex-grow: 1;
	padding: 15px;
	border-radius: 8px;
	border: 1px solid var(--border-color);
	background-color: var(--bg-card);
	color: var(--text-primary);
	font-size: 1rem;
	min-width: 250px;
	font-family: var(--font-body);
}

.subscribe-form input[type="email"]:focus {
	outline: none;
	border-color: var(--accent-color);
}

.subscribe-form input[type="email"]::placeholder {
	color: var(--text-secondary);
}

.subscribe-form button {
	padding: 15px 30px;
	border: none;
	border-radius: 8px;
	background-color: var(--accent-color);
	color: var(--bg-dark);
	font-size: 1rem;
	font-weight: 700;
	cursor: pointer;
	transition: background-color 0.3s ease;
	font-family: var(--font-body);
}

.subscribe-form button:hover {
	background-color: var(--accent-hover);
}

.back-link {
	background: none;
	border: none;
	color: var(--text-secondary);
	text-decoration: none;
	font-size: 1rem;
	cursor: pointer;
	transition: color 0.3s ease;
	font-family: var(--font-body);
}

.back-link:hover {
	color: var(--accent-hover);
}

/* --- 动画效果 --- */
@keyframes fadeIn {
	from {
		opacity: 0;
		transform: translateY(20px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

@keyframes bounce {
	0%,
	20%,
	50%,
	80%,
	100% {
		transform: translate(-50%, 0);
	}
	40% {
		transform: translate(-50%, -15px);
	}
	60% {
		transform: translate(-50%, -7px);
	}
}

@keyframes scroll-dot {
	0% {
		transform: translate(-50%, 0);
		opacity: 1;
	}
	50% {
		transform: translate(-50%, 10px);
		opacity: 0;
	}
	100% {
		transform: translate(-50%, 0);
		opacity: 1;
	}
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
	.subscribe-form {
		flex-direction: column;
		align-items: center;
	}

	.subscribe-form input[type="email"] {
		min-width: 100%;
		margin-bottom: 10px;
	}

	.close {
		right: 20px;
		font-size: 30px;
	}
}